[Bug 280386] if_bridge throws output errors under load

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280386

--- Comment #21 from Kevin Bowling <kbowling@freebsd.org> ---
(In reply to pascal.guitierrez from comment #20)
> Do you know if this is expected behaviour or is it a problem?
Caveat it has been a long time since I have been line-rating large numbers of
FreeBSD systems so I may not be privy to all the developments in the network
stack.. but I would say more /known/ than /expected/.  With the if_bridge in
play maybe you are more likely to see this since that may imply TSO was masked
off and you have a more expensive transmit path.

I think https://reviews.freebsd.org/D4295 would be one way to fix the issue but
I am not sure it is the only or best way.

In principle there isn't a problem because dropping packets is an expected
behavior of overfull queues at any point of the network and TCP or other
protocols should be dealing with it.  But it is obviously suboptimal if we have
enough context to do something smarter.

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